private List<String> getCurrentServerIds(boolean nag, boolean lagged) {
try (Jedis jedis = pool.getResource()) {
long time = getRedisTime(jedis.time());
int nagTime = 0;
if (nag) {
nagTime = nagAboutServers.decrementAndGet();
if (nagTime <= 0) {
nagAboutServers.set(10);
}
}
ImmutableList.Builder<String> servers = ImmutableList.builder();
Map<String, String> heartbeats = jedis.hgetAll("heartbeats");
for (Map.Entry<String, String> entry : heartbeats.entrySet()) {
try {
long stamp = Long.parseLong(entry.getValue());
if (lagged ? time >= stamp + 30 : time <= stamp + 30) servers.add(entry.getKey());
else if (nag && nagTime <= 0) {
getLogger()
.severe(
entry.getKey()
+ " is "
+ (time - stamp)
+ " seconds behind! (Time not synchronized or server down?)");
}
} catch (NumberFormatException ignored) {
}
}
return servers.build();
} catch (JedisConnectionException e) {
getLogger().log(Level.SEVERE, "Unable to fetch server IDs", e);
return Collections.singletonList(configuration.getServerId());
}
}
private void loadConfig() throws IOException, JedisConnectionException {
if (!getDataFolder().exists()) {
getDataFolder().mkdir();
}
File file = new File(getDataFolder(), "config.yml");
if (!file.exists()) {
file.createNewFile();
try (InputStream in = getResourceAsStream("example_config.yml");
OutputStream out = new FileOutputStream(file)) {
ByteStreams.copy(in, out);
}
}
final Configuration configuration =
ConfigurationProvider.getProvider(YamlConfiguration.class).load(file);
final String redisServer = configuration.getString("redis-server", "localhost");
final int redisPort = configuration.getInt("redis-port", 6379);
String redisPassword = configuration.getString("redis-password");
String serverId = configuration.getString("server-id");
if (redisPassword != null && (redisPassword.isEmpty() || redisPassword.equals("none"))) {
redisPassword = null;
}
// Configuration sanity checks.
if (serverId == null || serverId.isEmpty()) {
throw new RuntimeException("server-id is not specified in the configuration or is empty");
}
if (redisServer != null && !redisServer.isEmpty()) {
final String finalRedisPassword = redisPassword;
FutureTask<JedisPool> task =
new FutureTask<>(
new Callable<JedisPool>() {
@Override
public JedisPool call() throws Exception {
// With recent versions of Jedis, we must set the classloader to the one
// BungeeCord used
// to load RedisBungee with.
ClassLoader previous = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(RedisBungee.class.getClassLoader());
// Create the pool...
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(configuration.getInt("max-redis-connections", 8));
JedisPool pool =
new JedisPool(config, redisServer, redisPort, 0, finalRedisPassword);
// Reset classloader and return the pool
Thread.currentThread().setContextClassLoader(previous);
return pool;
}
});
getProxy().getScheduler().runAsync(this, task);
try {
pool = task.get();
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException("Unable to create Redis pool", e);
}
// Test the connection
try (Jedis rsc = pool.getResource()) {
rsc.ping();
// If that worked, now we can check for an existing, alive Bungee:
File crashFile = new File(getDataFolder(), "restarted_from_crash.txt");
if (crashFile.exists()) {
crashFile.delete();
} else if (rsc.hexists("heartbeats", serverId)) {
try {
long value = Long.parseLong(rsc.hget("heartbeats", serverId));
if (System.currentTimeMillis() < value + 20000) {
getLogger()
.severe(
"You have launched a possible impostor BungeeCord instance. Another instance is already running.");
getLogger()
.severe("For data consistency reasons, RedisBungee will now disable itself.");
getLogger()
.severe(
"If this instance is coming up from a crash, create a file in your RedisBungee plugins directory with the name 'restarted_from_crash.txt' and RedisBungee will not perform this check.");
throw new RuntimeException("Possible impostor instance!");
}
} catch (NumberFormatException ignored) {
}
}
FutureTask<Void> task2 =
new FutureTask<>(
new Callable<Void>() {
@Override
public Void call() throws Exception {
httpClient = new OkHttpClient();
Dispatcher dispatcher = new Dispatcher(getExecutorService());
httpClient.setDispatcher(dispatcher);
NameFetcher.setHttpClient(httpClient);
UUIDFetcher.setHttpClient(httpClient);
RedisBungee.configuration =
new RedisBungeeConfiguration(RedisBungee.this.getPool(), configuration);
return null;
}
});
getProxy().getScheduler().runAsync(this, task2);
try {
task2.get();
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException("Unable to create HTTP client", e);
}
getLogger().log(Level.INFO, "Successfully connected to Redis.");
} catch (JedisConnectionException e) {
pool.destroy();
pool = null;
throw e;
}
} else {
throw new RuntimeException("No redis server specified!");
}
}
private long getRedisTime(List<String> timeRes) {
return Long.parseLong(timeRes.get(0));
}